为什么我的C#代码会出现零';s在单击“退出”后显示在消息框中
本文关键字:退出 单击 消息 显示 代码 我的 为什么 | 更新日期: 2023-09-27 17:58:08
我正试图让我的消息框显示存储在我的数组中的发票小计。。。其中5个使用foreach方法显示在消息框中。我应该输入一个工资,然后它进行一些计算,并将小计值存储到数组中。我声明了一个名为decArray和intIndex的数组和索引。有人能告诉我我错过了什么或做错了什么吗?提前谢谢!
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace InvoiceTotal
{
public partial class frmInvoiceTotal : Form
{
public frmInvoiceTotal()
{
InitializeComponent();
}
// TODO: declare class variables for array and list here
decimal[] decArray = new decimal[5];
int intIndex = 0;
private void btnCalculate_Click(object sender, EventArgs e)
{
try
{
if (txtSubtotal.Text == "")
{
MessageBox.Show(
"Subtotal is a required field.", "Entry Error");
}
else
{
decimal subtotal = Decimal.Parse(txtSubtotal.Text);
if (subtotal > 0 && subtotal < 10000)
{
decimal discountPercent = 0m;
if (subtotal >= 500)
discountPercent = .2m;
else if (subtotal >= 250 & subtotal < 500)
discountPercent = .15m;
else if (subtotal >= 100 & subtotal < 250)
discountPercent = .1m;
decimal discountAmount = subtotal * discountPercent;
decimal invoiceTotal = subtotal - discountAmount;
discountAmount = Math.Round(discountAmount, 2);
invoiceTotal = Math.Round(invoiceTotal, 2);
txtDiscountPercent.Text = discountPercent.ToString("p1");
txtDiscountAmount.Text = discountAmount.ToString();
txtTotal.Text = invoiceTotal.ToString();
for (intIndex = 0; intIndex <= decArray.Length - 1; intIndex++)
{
DecArray[intIndex] = InvoiceTotal
}
}
else
{
MessageBox.Show(
"Subtotal must be greater than 0 and less than 10,000.",
"Entry Error");
}
}
}
catch (FormatException)
{
MessageBox.Show(
"Please enter a valid number for the Subtotal field.",
"Entry Error");
}
txtSubtotal.Focus();
}
private void btnExit_Click(object sender, EventArgs e)
{
// TODO: add code that displays dialog boxes here
string totalstring = "";
foreach (decimal value in decArray)
{
totalstring += value + "'n";
MessageBox.Show(totalstring + "'n", "Order Totals");
}
this.Close();
}
}
}
您永远不会将分配给decArray
(例如decArray[0] = n;
)
如果您添加一个计数变量来增加数组计数,那么您可以添加多个数量。您还希望允许阵列根据需要调整大小。
decimal[] decArray = new decimal[5];
int _indexCount = 0;
private void btnCalculate_Click(object sender, EventArgs e)
{
...
if (decArray.Count() == _indexCount)
{
var elementHolder = decArray;
decArray = new T[(decArray.Length + 1) * 2];
for (int i = 0; i < elementHolder.Length; i++)
{
decArray[i] = elementHolder[i];
}
}
decArray[_indexCount] = invoiceTotal;
_indexCount++;
}
这样的东西应该行得通。
编辑:你得到这么多消息的原因是MessageBox.Show()
在foreach循环内,只要把它放在循环外,你就会只看到一个。
private void btnExit_Click(object sender, EventArgs e)
{
// TODO: add code that displays dialog boxes here
string totalstring = "";
foreach (decimal value in decArray)
{
totalstring += value + "'n";
}
MessageBox.Show(totalstring + "'n", "Order Totals");
this.Close();
}